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권현섭,정지미,임윤정,남소현,임지나,정미림 대한신생아학회 2015 Neonatal medicine Vol.22 No.3
PURPOSE This study investigated the risks of development and surgical complications of meconium obstruction (MO) in very low birth weight (VLBW) infants. METHODS We performed a retrospective medical record review of VLBW infants admitted to the neonatal intensive care unit of Haeundae Paik hospital and diagnosed with MO of prematurity (MOP) between March 2010 and August 2013. RESULTS Of 267 VLBW infants admitted to the neonatal intensive care unit, 28 were diagnosed with MOP. Perinatal factors including maternal pregnancy-induced hypertension and small for gestational age were associated with MOP development (P<0.05). Over two-thirds of VLBW infants with MOP were successfully treated with a gastrografin enema. The remaining eight VLBW infants required surgery. Although small for gestational age was more frequent in the medical treatment group, specific risk factors associated with MOP development did not affect the need for surgical intervention. CONCLUSION MOP is common in VLBW infants, as most VLBW infants have risk factors for MOP. Identifying risk factors permits early diagnosis and initiation of appropriate medical treatment, reducing the necessity for surgery. However, the presence of specific risk factors does not increase risk of surgical complications.
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STCM: 단안 카메라의 싱글 이미지 깊이 추정에서 손실 최소화를 위한 새로운 연산 전략
이창엽,권현섭,김동주,한순신,서영주,황도경 대한전자공학회 2024 전자공학회논문지 Vol.61 No.4
본 논문에서는 단안 카메라 기반의 깊이 추정 해석을 위한 단일 이미지에서 깊이 추정 방법을 제안한다. 제안된 방법은 기존 딥러닝의 이미지 분류 도메인에서 널리 쓰이는 Split-Transform-Merge(STM) 전략을 Monocular Depth Estimation(MDE) 도메인에 범용적으로 적용될 수 있도록 변형된 전략이며, 깊이 추정 성능 향상을 목적으로 하는 기법이다. 기존에는 단순하게 단일 이미지를 네트워크에 입력하고 출력하는 회귀, 이산화된 깊이 값 클래스들(Bins)을 사전정의하고 네트워크의 출력으로는 각 픽셀의 Bins 확률값을 구하는 분류, 총 두 가지의 작업이 존재했다. 더 나아가, Bins를 사전정의하는 것이 아니라 네트워크의 마지막 출력에 Bins 추정 모듈을 추가시켜 학습할 수 있는 적응성 Bins 기술로 패러다임 전환하였으며, 최근에는 더 정확한 적응성 Bins 추정을 위해 여러 종류의 Bins 추정 모듈에 관한 많은 연구가 이루어지고 있다. 하지만 고차원의 피쳐맵 표현들이 Bins 추정 모듈에 입력될 때, 저차원 피쳐맵 표현들로 사영되어 입력되고 이는 필연적인 정보 손실을 초래하는 제한점이 있었다. 이러한 제한점을 개선하기 위해 피쳐맵 표현들과 Bins 추정 모듈과의 관계를 심층적으로 분석하고 정보 손실이 일어나는 제한점을 개선한 Split-Transform-Conversion-Merge(STCM) 전략을 새롭게 제안한다. 그리고 제안된 연산 전략의 성능 검증을 위해, MDE목적의 여러 기법들에 적용하여 성능 향상 결과를 확인하였고, 실험을 통해 모든 평가 지표에서 향상된 성능을 보였을뿐만 아니라 시각적인 성능에도 높은 향상을 확인하였다. This paper presents a method for estimating depth from a single image using monocular camera-based depth estimation analysis. Our proposed method is a variation of the Split-Transform-Merge (STM) strategy, widely employed in the existing deep learning image classification domain, adapted universally to the Monocular Depth Estimation (MDE) domain. The primary aim of our technique is to enhance depth estimation performance. Traditionally, there were two tasks in this domain: regression, which involves inputting and outputting a single image into the network, and classification, which predefined discretized depth value classes (Bins). The classification task aimed to obtain the Bins probability value for each pixel as the network output. However, a paradigm shift has shifted from predefined Bins to adaptive Bins technology. This technology allows learning by adding a Bins estimation module to the final network output. Recent research has focused on various types of Bins estimation modules to achieve more accurate adaptive Bins estimation. One limitation arises when high-dimensional feature map representations are input to the Bins estimation module. These representations are projected and input as low-dimensional feature map representations, inevitably leading to information loss. We propose a novel Split-Transform-Conversion-Merge (STCM) strategy to address these limitations. This strategy delves deep into the relationship between feature map representations and Bins estimation modules, thereby improving the boundaries of information loss. To validate the performance of our proposed strategy, we applied it to various MDE techniques, observing significant improvements in performance across all evaluation metrics. Additionally, we noted enhanced visual performance in our experiments.
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배대경,정선욱,권현섭 대한슬관절학회 1998 대한슬관절학회지 Vol.10 No.1
Ligament injuries of the knee joint are very common among competitive athletes. Acrurate assessment of the nature of these injuries is a prerequisite for appropriate therapy. The purpose of this study is to evaluate the significance of MRI findings in assesing the status of ACL tear and associated injuries. 31 cases of ACL injuries were examined and reconstructed arthroscopically from Jan. 1997 to Sep. 1997 at Kyung Hee University Hospital. 1n all cases, we reviewed preoperative physical and MRI findings and performed postoperative radiologic assessments. Results were as follows; 1. Lachman test and Pivot shift test were positive in all 31 cases but anterior drawer test was positive in 29 cases. 2. In MRI findings, 24 cases were interpretated as complete ACL tear and 7 cases as inccomplete ACL tear. But these 7 cases were confirmed as complete tear in arthroscopic examination with careful probing of ACL fiher. 3. MRI showed associated meniscal injuries in 19 cases(61%)-14 cases(74%) at medial meniscus, 5 cases(26%) at lateral meniscus. All cases were confirmed arthroscopically. In conc1usion, physical findings are more reliable than MRI findings in diagnosing the complete ACL tear and deciding the ACL reconstruction. But MRI findings are very helpful to assess the associated injuries and plan the treatments.
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배대경,정선욱,권현섭 대한슬관절학회 1998 대한슬관절학회지 Vol.10 No.1
The suprapatellar plica is a remnant of the embryonic septum separating the suprapatellar pouch from the knee joint. Complete type of suprapatellar plica is rarely reported and its clinlical significance is controversial. The purpose of this study is to verify the complete type of suprapatellar plica as an important cause of anterior knee pain and to evaluate the clinical results after arthroscopic excisien of it. From September 1991 to April 1997, we studied prospectively 54 patients, 90 knees which were diagnosed as cornplete type of suprapatellar plica preoperatively. The mean age was 32 years (15-57 years) and sex distribution was 14 males and 40 females. For the preoperative diagnosis, we checked clinical symptom, past history, physical finding and plain X-ray routinely and performed bone scan, double contrast arthrogram and MRI, if necessary. All patients complained vague anterior knee pain at standing, sitting, stair climbing and exercise for long times. All 90 knees were examined arthroscopically. Among them, 80 knees had complete type of suprapatellar plica and remaining 10 knees had other findings. After all, positive predictive value of preoperative diagnosis for complete type of suprapatellar plica was 89%. Among 36 patients diagnosed as bilateral preoperatively, 33 patients(92%) were confirmed as bilateral in arthroscopic examination. After arthroscopic excision of plica, clinical results were total relief of pain in 19 knees(24%), improvement in 55 knees(69%), no change in 6 knees(7%) and none of worsening. In conclusion, complete type of suprapatellar plica should be considered as an important cause of anterior knee pain especially which is vague, intermittent and bilateral.
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Clinical Neuroanatomy and Neurotransmitter-Mediated Regulation of Penile Erection
정준양,조현우,권현섭,정나영 대한배뇨장애요실금학회 2014 International Neurourology Journal Vol.18 No.2
Erectile dysfunction (ED) has an adverse impact on men’s quality of life. Penile erection, which is regulated by nerves that are innervatedinto the erectile tissue, can be affected by functional or anatomical trauma of the perineal region, including specificstructures of the penis, causing ED. Penile erection is neurologically controlled by the autonomic nervous system. Therefore, it isof utmost importance to understand the neurogenic structure of the erectile tissue and the types of neurotransmitters involvedin the penile erection process. Here, we highlight the basic clinical anatomy and erectile function of the penis. Understandingthe clinical connotation of the relationship between penile erectile structure and function may provide fresh insights for identifyingthe main mechanisms involved in ED and help develop surgical techniques for the treatment of ED.
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박재영,조윤제,유명철,권현섭 대한골절학회 1998 대한골절학회지 Vol.11 No.4
Osteochondral fracture is an often painful, usually unilateral condition that occurs in young adults in which a segment of articular cartilage and an attached fragment of subchondral bone become partially or completely separated from the underlying bone. Accurate diagnosis of osteochondral fracture of the talus, mainly caused by trauma, is difficult because osteochondral lesion is not detected easily on the roentgenographic examination. Osteochondral fracture is intraarticular fracture, thus operative approach and fixation is technically difficult and requires considerable expertise to work. Authors treated 5 patients who had osteochondral fracture of talus, with suhchondral bone curettage through percutaneous extraarticular transtalar approach under the C-arm guide without arthrotomy in three cases of minimally detached or elevated osteochondral fragment. And two cases of partially detached osteochondral fragment treated by bone peg fixation with arthrotomy. We obtained good functional results at the follow-up of a mean of 1 year and 5 months. We believe that the subchondral curettage and bone peg fixation are excellent treatment methods for osteochondral fracture of the talus.
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인공 고관절 전치환술 후 발생한 Metallosis에 대한 연구
유명철 ( Myung Chul Yoo ),조윤제 ( Yoon Je Cho ),이용욱 ( Yong Wook Lee ),김강일 ( Kang Il Kim ),권현섭 ( Hyun Sub Kwon ),전영수 ( Young Soo Chun ) 대한고관절학회 1998 Hip and Pelvis Vol.10 No.1
We retrospectively analyzed 13 cases in 12 patients who were diagnosed as having metallosis in revision total hip arthroplasty. The incidence of metallosis was 6.7% in 195 revision total hip arthroplasties. There was no specific correlation between clinical symptoms and metallosis. The histological findings were indistinguishable between metal debris and polyethylene debris in light microscope. Osteolysis was associated in all cases but did not compromise the stability of prosthesis. The possible mechanisms of metallosis were postulated and classified into three categories First, direct abrasion between the metal shell and the prosthetic head after the breakage of polyethylene liner. Second, direct abrasion between the metal shell and the prosthetic head after dislodging of the polyethylene liner due to impingement of the neck of femoral prosthesis on the polyethylene liner. Third, body wear of articulating surface.
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